/*
 * Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 * 
 *  http://aws.amazon.com/apache2.0
 * 
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */
using System.Collections;

namespace Amazon.Lambda.RuntimeSupport
{
    /// <summary>
    /// Interface to access environment variables.
    /// Allows for unit testing without changing the real System environment variables.
    /// </summary>
    public interface IEnvironmentVariables
    {
        /// <summary>
        /// Sets the value for an environment variable.
        /// </summary>
        /// <param name="variable"></param>
        /// <param name="value"></param>
        void SetEnvironmentVariable(string variable, string value);

        /// <summary>
        /// Get the value for an environment variable.
        /// </summary>
        /// <param name="variable"></param>
        /// <returns></returns>
        string GetEnvironmentVariable(string variable);

        /// <summary>
        /// Get all environment variables.
        /// </summary>
        /// <returns></returns>
        IDictionary GetEnvironmentVariables();
    }
}
